Dear useRs,
I am working on a project involving the clustering of a large dataset. I need
to extract specific sub-clusters from the parent dendrogram for further
analysis. The data is too large for the use of convenient tools such as
identify.clust (it selects the specific group of interest on a graph), so
alternatively I have saved the plot as a large image file so that it can be
printed or viewed piecemeal. My problem is this: when I find the subclusters
that I need to analyze I have no way to reference that specific component of
the dendrogram in order to extract it:
smallDend <- dend[[i]][[j]][[k]] where i,j,k refer to levels of the dendrogram
(it's "address")
I would like to print the "address" of the smaller dendrograms on the edge
similar to this:
addr <- function(n) {
if(!is.leaf(n)) {
attr(n, "edgetext") <- paste("height of",(attr(n,"height"))
}
n
}
labeledDends <- dendrapply(dend, addr)
Where "i,j,k" is printed instead of "height". But I have not been able to
figure out how to ask each dendrogram its address within the dendrapply
function. Can anyone help me with this?
Many thanks,
Jesse
PhD Student in Social Science
Syracuse University
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